# All files / controllers WhatsAppController.js

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     /**
     * WhatsAppController.js
     *
     * Controller for WhatsApp operations
     * Handles connection, messaging, and status management
     *
     * @module controllers/WhatsAppController
     */

    const { logger } = require('../config/logger');
    const { getWhatsAppService } = require('../services/WhatsAppService');

    /**
     * WhatsApp Controller
     * All methods are tenant-scoped via req.tenant.id
     */
    class WhatsAppController {
      /**
       * Connect WhatsApp for tenant
       * POST /api/tenant/whatsapp/connect
       */
      static async connect(req, res) {
        try {
          // Check if tenant exists
          if (!req.tenant || !req.tenant.id) {
            logger.error('Tenant not found in request');
            return res.status(400).json({
              success: false,
              message: 'Tenant information not found. Please login again.'
            });
          }

          const tenantId = req.tenant.id;
          const io = req.app.get('io');
          const whatsappService = getWhatsAppService(io);

          logger.info(`Connecting WhatsApp for tenant ${tenantId}`);

          const instance = await whatsappService.initializeTenant(tenantId);

          // Get current status and QR code
          const status = await whatsappService.getTenantStatus(tenantId);

          logger.info(`WhatsApp connection initiated for tenant ${tenantId}`, {
            hasQR: !!status.qr,
            status: status.status
          });

          res.json({
            success: true,
            message: 'WhatsApp connection initiated',
            data: {
              status: status.status,
              qr: status.qr || null,
              phoneNumber: status.phoneNumber || null
            }
          });
        } catch (error) {
          logger.error(`Error connecting WhatsApp: ${error.message}`, {
            tenantId: req.tenant.id,
            error: error.stack
          });
          res.status(500).json({
            success: false,
            message: 'Failed to connect WhatsApp',
            error: error.message
          });
        }
      }

      /**
       * Disconnect WhatsApp for tenant
       * POST /api/tenant/whatsapp/disconnect
       */
      static async disconnect(req, res) {
        try {
          const tenantId = req.tenant.id;
          const io = req.app.get('io');
          const whatsappService = getWhatsAppService(io);

          logger.info(`Disconnecting WhatsApp for tenant ${tenantId}`);

          await whatsappService.disconnectTenant(tenantId);

          res.json({
            success: true,
            message: 'WhatsApp disconnected successfully'
          });
        } catch (error) {
          logger.error(`Error disconnecting WhatsApp: ${error.message}`, {
            tenantId: req.tenant.id,
            error: error.stack
          });
          res.status(500).json({
            success: false,
            message: 'Failed to disconnect WhatsApp',
            error: error.message
          });
        }
      }

      /**
       * Get WhatsApp connection status
       * GET /api/tenant/whatsapp/status
       */
      static async getStatus(req, res) {
        try {
          const tenantId = req.tenant.id;
          const io = req.app.get('io');
          const whatsappService = getWhatsAppService(io);

          const status = await whatsappService.getTenantStatus(tenantId);

          res.json({
            success: true,
            data: status
          });
        } catch (error) {
          logger.error(`Error getting WhatsApp status: ${error.message}`, {
            tenantId: req.tenant.id,
            error: error.stack
          });
          res.status(500).json({
            success: false,
            message: 'Failed to get WhatsApp status',
            error: error.message
          });
        }
      }

      /**
       * Get QR code for connection
       * GET /api/tenant/whatsapp/qr
       */
      static async getQR(req, res) {
        try {
          const tenantId = req.tenant.id;
          const io = req.app.get('io');
          const whatsappService = getWhatsAppService(io);

          const qrCode = await whatsappService.getQRCode(tenantId);

          if (!qrCode) {
            return res.status(404).json({
              success: false,
              message: 'No QR code available'
            });
          }

          res.json({
            success: true,
            data: { qrCode }
          });
        } catch (error) {
          logger.error(`Error getting QR code: ${error.message}`, {
            tenantId: req.tenant.id,
            error: error.stack
          });
          res.status(500).json({
            success: false,
            message: 'Failed to get QR code',
            error: error.message
          });
        }
      }

      /**
       * Clear WhatsApp session
       * DELETE /api/tenant/whatsapp/session
       */
      static async clearSession(req, res) {
        try {
          const tenantId = req.tenant.id;
          const io = req.app.get('io');
          const whatsappService = getWhatsAppService(io);

          logger.info(`Clearing WhatsApp session for tenant ${tenantId}`);

          await whatsappService.clearTenantSession(tenantId);

          res.json({
            success: true,
            message: 'WhatsApp session cleared successfully'
          });
        } catch (error) {
          logger.error(`Error clearing session: ${error.message}`, {
            tenantId: req.tenant.id,
            error: error.stack
          });
          res.status(500).json({
            success: false,
            message: 'Failed to clear session',
            error: error.message
          });
        }
      }

      /**
       * Send WhatsApp message
       * POST /api/tenant/whatsapp/send
       * Body: { phoneNumber, message, mediaUrl? }
       */
      static async sendMessage(req, res) {
        try {
          const tenantId = req.tenant.id;
          const { phoneNumber, message, mediaUrl } = req.body;

          // Validate input
          if (!phoneNumber || !message) {
            return res.status(400).json({
              success: false,
              message: 'Phone number and message are required'
            });
          }

          const io = req.app.get('io');
          const whatsappService = getWhatsAppService(io);

          logger.info(`Sending WhatsApp message for tenant ${tenantId} to ${phoneNumber}`);

          // Send message (mediaUrl not supported yet, would need sendMediaMessage)
          const result = await whatsappService.sendMessage(tenantId, phoneNumber, message);

          // Check if the service returned an error
          if (result.success === false) {
            return res.status(500).json({
              success: false,
              message: result.error || 'Failed to send message',
              error: result.error
            });
          }

          res.json({
            success: true,
            message: 'Message sent successfully',
            data: result
          });
        } catch (error) {
          logger.error(`Error sending message: ${error.message}`, {
            tenantId: req.tenant.id,
            error: error.stack
          });
          res.status(500).json({
            success: false,
            message: 'Failed to send message',
            error: error.message
          });
        }
      }

      /**
       * Get WhatsApp messages
       * GET /api/tenant/whatsapp/messages?limit=50&offset=0&phoneNumber=
       */
      static async getMessages(req, res) {
        try {
          const tenantId = req.tenant.id;
          const { limit = 50, offset = 0, phoneNumber } = req.query;

          const io = req.app.get('io');
          const whatsappService = getWhatsAppService(io);

          const messages = await whatsappService.getMessages(tenantId, {
            limit: parseInt(limit),
            offset: parseInt(offset),
            phoneNumber
          });

          res.json({
            success: true,
            data: messages
          });
        } catch (error) {
          logger.error(`Error getting messages: ${error.message}`, {
            tenantId: req.tenant.id,
            error: error.stack
          });
          res.status(500).json({
            success: false,
            message: 'Failed to get messages',
            error: error.message
          });
        }
      }

      /**
       * Get WhatsApp contacts
       * GET /api/tenant/whatsapp/contacts?limit=50&offset=0&search=
       */
      static async getContacts(req, res) {
        try {
          const tenantId = req.tenant.id;
          const { limit = 50, offset = 0, search } = req.query;

          const io = req.app.get('io');
          const whatsappService = getWhatsAppService(io);

          const contacts = await whatsappService.getContacts(tenantId, {
            limit: parseInt(limit),
            offset: parseInt(offset),
            search
          });

          res.json({
            success: true,
            data: contacts
          });
        } catch (error) {
          logger.error(`Error getting contacts: ${error.message}`, {
            tenantId: req.tenant.id,
            error: error.stack
          });
          res.status(500).json({
            success: false,
            message: 'Failed to get contacts',
            error: error.message
          });
        }
      }
    }

    module.exports = WhatsAppController;